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Author: David A. Meggers Publisher: ISBN: Category : Languages : en Pages : 11
Book Description
In 2009, the Kansas Department of Transportation entered into an agreement with the Federal Highway Administration to fulfill the requirements of the High Friction Surface Materials Enhancing Safety at Horizontal Curves on the National Highway System project. Four locations were chosen in Kansas, two on existing asphalt pavement and two on concrete pavement. The applications on asphalt were on highway segments and the concrete segments were medium to high volume ramps at two separate interchanges. Traffic volumes ranged from approximately 1,000 vehicles per day to 25,000 vehicles per day. In general, the surfaces are performing poorly; one of the lower trafficked surfaces, an asphalt application, failed in less than three years. The surfaces on the two applications on concrete are peeling off and skid resistance numbers are dropping. In late 2013 and early 2014, the surfaces were evaluated and several tests were performed to determine quality of the product with less than desirable results. Tests performed included bond testing of the High Friction Surface (HFS), rapid chloride permeability testing of the pavements with and without the HFS, and skid resistance testing. The skid resistance values were compared to skid testing that was performed immediately before placement, immediately after placement, and intermediate skid testing. Results of the testing were mixed; bond was generally poor and skid resistance was dropping rapidly. The results of the review have led to a rewrite of the application specification with an improvement in the surface preparation.
Author: David A. Meggers Publisher: ISBN: Category : Languages : en Pages : 11
Book Description
In 2009, the Kansas Department of Transportation entered into an agreement with the Federal Highway Administration to fulfill the requirements of the High Friction Surface Materials Enhancing Safety at Horizontal Curves on the National Highway System project. Four locations were chosen in Kansas, two on existing asphalt pavement and two on concrete pavement. The applications on asphalt were on highway segments and the concrete segments were medium to high volume ramps at two separate interchanges. Traffic volumes ranged from approximately 1,000 vehicles per day to 25,000 vehicles per day. In general, the surfaces are performing poorly; one of the lower trafficked surfaces, an asphalt application, failed in less than three years. The surfaces on the two applications on concrete are peeling off and skid resistance numbers are dropping. In late 2013 and early 2014, the surfaces were evaluated and several tests were performed to determine quality of the product with less than desirable results. Tests performed included bond testing of the High Friction Surface (HFS), rapid chloride permeability testing of the pavements with and without the HFS, and skid resistance testing. The skid resistance values were compared to skid testing that was performed immediately before placement, immediately after placement, and intermediate skid testing. Results of the testing were mixed; bond was generally poor and skid resistance was dropping rapidly. The results of the review have led to a rewrite of the application specification with an improvement in the surface preparation.
Author: Humaira Zahir Publisher: ISBN: Category : Languages : en Pages : 89
Book Description
The Federal Highway Administration (FHWA) estimates that about 70% of wet pavement crashes can be prevented or minimized by improving pavement friction. High Friction Surface Treatment (HFST), a specially-designed thin surface application of hard aggregates and thermosetting resins like epoxy, has been proven to be an effective method to increase road surface friction. Calcined bauxite has been predominantly used in the United States as the hard aggregate in combination with an epoxy binder for HFST. However, this treatment is expensive since the calcined bauxite is imported. The objectives of this study are to evaluate the performance of a local aggregate in HFST and to evaluate the 3-dimensional laser profiler for measuring pavement texture. Slab specimens of hot-mix asphalt (HMA) were compacted in the laboratory and treated with HFST systems incorporating both calcined bauxite and a local, hard flint aggregate from Picher, Oklahoma. The treated HMA specimens were then tested with a Dynamic Friction Tester (DFT) and a Circular Track Meter (CTM) to determine the frictional coefficient and texture depth, respectively. Also, Hamburg Wheel Tracking Device tests were conducted on these HFST systems to evaluate wearing resistance under repetitive wheel load. Field measurements of texture depths on HFST were also done. Statistical analysis was performed to compare the performance of high friction surfaces prepared with different aggregate epoxy combinations. The results show that flint aggregate can be a suitable substitute for the calcined bauxite in HFST. Field measurements also showed marked improvements in texture depth with HFST. Texture depth and skid number determined by the ASTM skid trailer vary with pavement surface types and treatments. Mean Texture Depth (MTD) of high friction surface treatment is generally greater than 1 mm. A good correlation between skid number and MTD was found for the MTD range of 0.5 to 1.5 mm.
Author: Ethan Linden Publisher: ISBN: Category : Languages : en Pages : 61
Book Description
With noise issues arising frequently in urban areas due to heavy traffic, it might be possible to use High Friction Surfaces (HFS) to reduce the sound to an acceptable level without a barrier wall or in conjunction with one. This research project determines the influence of HFS on traffic noise levels. The purpose of this project is to extend on previous research by including more evaluation on HFS Polymer Overlays. Research of several standardized methods of testing led to the selection of Statistical Pass-By Method (SPB) as the best method of measuring highway noise levels. While SPB calls for testing of a specific amount of random car pass-bys in order to draw a sound level conclusion, the team utilized a modified SPB testing method using one specific car for all test passes, creating a more controlled testing environment due to the wide variety of vehicle types traveling on the highways. The Kansas State Senior Design Team decided upon a test strip of 300 ft in order to accurately evaluate the HFS. The Kansas Department of Transportation (KDOT) in Wamego, KS, placed an HFS test strip of 300 ft on US Highway 24. The Kansas State Senior Design Team purchased the resin for the test strip from Transpo Industries, and Flint Rock donated the aggregate. KDOT and Performance Contracting Inc. (PCI) completed the test strip on June 22, 2016. To perform simple and accurate testing, the Senior Design Team created a detailed testing setup and procedure for the testing. Using the testing procedure and a SoundTrack LxT, the team performed four different tests (three modified SPB and a final normal SPB test). The data collected from these tests resulted in an average sound change less than the 5-dB amount considered noticeable to the human ear. As a result, this report concludes that HFS is not an effective stand-alone alternative to sound barrier walls but could be used in conjunction with other actions to reach an acceptable level of noise reduction in urban areas.
Author: S. H. Dahir Publisher: Transportation Research Board ISBN: 9780309049047 Category : Technology & Engineering Languages : en Pages : 68
Book Description
This synthesis will be of interest to pavement engineers, safety officers, and others interested in wet-pavement safety programs. Information is provided on the programs used by a number of agencies in gathering data and correcting areas of potential wet-weather accidents. Wet-pavement accidents continue to be of concern to highway agencies. This report of the Transportation Research Board summarizes agencies' programs in areas such as accident reporting, vehicle testing, friction testing, corrective actions for problem areas, and tort liability and gives some general guidelines for the content of a wet-pavement safety program.
Author: Humaira Zahir Publisher: ISBN: Category : Languages : en Pages :
Book Description
Road surfaces may prematurely lose pavement friction due to polished aggregates on sharp horizontal curves, steep grades, or near intersections resulting in vehicle skidding. The problem gets exacerbated during wet weather. The Federal Highway Administration (FHWA) estimates that about 70% of wet pavement crashes can be prevented or minimized by improving pavement friction. High Friction Surface Treatment (HFST), a specially-designed thin surface application of hard aggregates and thermosetting resins like epoxy, has been proven to be an effective method to increase road surface friction. Calcined bauxite has been predominantly used in the United States as the hard aggregate in combination with an epoxy binder for HFST. However, this treatment is expensive since the calcined bauxite is imported. The objective of this study is to evaluate the performance of a local aggregate in HFST. Slab specimens of hot-mix asphalt (HMA) were compacted in the laboratory and treated with HFST systems incorporating both calcined bauxite and a local, hard aggregate, Picher Oklahoma flint aggregate. The treated HMA specimens were then tested with a Dynamic Friction Tester (DFT) and a Circular Track Meter (CTM) to determine the frictional coefficient and texture depth, respectively. Also, Hamburg Wheel Tracking Device Testing were conducted on these HFST systems to evaluate wearing resistance under repetitive wheel load. Field measurements of texture depths on HFST were also done. Statistical analysis was performed to compare the performance of high friction surfaces prepared with different aggregate epoxy combinations. The results show that flint aggregate can be a suitable substitute for the calcined bauxite in HFST. Field measurements also showed marked improvements in texture depth with HFST.
Author: David A. Meggers
Author: David A. Meggers
Author: Humaira Zahir
Author: Ethan Linden
Author: S. H. Dahir
Author: 
Author: Humaira Zahir
Author: 
Author: Defense Documentation Center (U.S.)
Author: 
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